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Two separate contacts are incorporated into the different arms of Quantum Cascade lasers with asymmetric Mach-Zehnder interferometer type cavities. Preliminary results reveal an almost-continuous single mode tuning range of 20 cm−1 at 80K.
Quantum Cascade lasers based on continuum-to-continuum design enable external cavity tuning over 340 cm−1 in pulsed mode operation at 15°C. Strong gain suppression over 320cm−1 is attributed to strong coupling between the laser transitions.
Single-mode Quantum Cascade lasers employing a candy-cane shaped Fabry-Perot cavity are demonstrated. Single-mode emission with ∼25 dB side mode suppression is achieved up to ∼500 mA above threshold current in pulsed operation.
A new Quantum Cascade laser design with a ldquotwo-steprdquo coupling between the injector and the active region provides a voltage tuning range of 200 cm-1 for electroluminescence and 80 cm-1 for laser spectra at room temperature.
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